1) Being one of 100 equal parts 2) Centennial year 3) Centesimal 4) Next after the ninety-ninth 5) Ordinal 1) Centesimal 
In arithmetic, a hundredth is a single part of something that has been divided equally into a hundred parts. For example, a hundredth of 675 is 6.75. A hundredth is the reciprocal of 100. A hundredth is written as a decimal fraction as 0.01, and as a vulgar fraction as 1/100. `Hundredth” is also the ordinal number that follows `ninety-ninth
• (n.) One of a hundred equal parts into which one whole is, or may be, divided; the quotient of a unit divided by a hundred. • (a.) Coming last of a hundred successive individuals or units. • (a.) Forming one of a hundred equal parts into which anything is divided; the tenth of a tenth.
Hun'dredth adjective 1. Coming last of a hundred successive individuals or units. 2. Forming one of a hundred equal parts into which anything is divided; the tenth of a tenth. Hun'dredth noun One of a hundred equal parts into which one whole is, or may be, divided; the quotient of a unit divided by a hundred. 
[adj] - the ordinal number of one hundred in counting order 2. [n] - position 100 in a countable series of things
centesimal adjective the ordinal number of one hundred in counting order
next after the ninety-ninth; being the ordinal number for 100. · being one of 100 equal parts.